#pragma once

#ifdef _MSC_VER
#pragma warning(push, 0)
#else
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wall"
#pragma GCC diagnostic ignored "-Wextra"
#pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
#include <libusb.h>
#ifdef _MSC_VER
#pragma warning(pop)
#else
#pragma GCC diagnostic pop
#endif

#include "Emu/Cell/lv2/sys_usbd.h"

struct UsbTransfer;

// Usb descriptors
enum : u8
{
	USB_DESCRIPTOR_DEVICE = 0x01,
	USB_DESCRIPTOR_CONFIG = 0x02,
	USB_DESCRIPTOR_STRING = 0x03,
	USB_DESCRIPTOR_INTERFACE = 0x04,
	USB_DESCRIPTOR_ENDPOINT = 0x05,
	USB_DESCRIPTOR_HID = 0x21,
	USB_DESCRIPTOR_ACI = 0x24,
	USB_DESCRIPTOR_ENDPOINT_ASI = 0x25,
};

struct UsbDeviceDescriptor
{
	le_t<u16, 1> bcdUSB;
	u8 bDeviceClass;
	u8 bDeviceSubClass;
	u8 bDeviceProtocol;
	u8 bMaxPacketSize0;
	le_t<u16, 1> idVendor;
	le_t<u16, 1> idProduct;
	le_t<u16, 1> bcdDevice;
	u8 iManufacturer;
	u8 iProduct;
	u8 iSerialNumber;
	u8 bNumConfigurations;
};

struct UsbDeviceConfiguration
{
	le_t<u16, 1> wTotalLength;
	u8 bNumInterfaces;
	u8 bConfigurationValue;
	u8 iConfiguration;
	u8 bmAttributes;
	u8 bMaxPower;
};

struct UsbDeviceInterface
{
	u8 bInterfaceNumber;
	u8 bAlternateSetting;
	u8 bNumEndpoints;
	u8 bInterfaceClass;
	u8 bInterfaceSubClass;
	u8 bInterfaceProtocol;
	u8 iInterface;
};

struct UsbDeviceEndpoint
{
	u8 bEndpointAddress;
	u8 bmAttributes;
	le_t<u16, 1> wMaxPacketSize;
	u8 bInterval;
};

struct UsbDeviceHID
{
	le_t<u16, 1> bcdHID;
	u8 bCountryCode;
	u8 bNumDescriptors;
	u8 bDescriptorType;
	le_t<u16, 1> wDescriptorLength;
};

struct UsbTransfer
{
	u32 assigned_number = 0;
	u32 transfer_id = 0;

	s32 result = 0;
	u32 count = 0;
	UsbDeviceIsoRequest iso_request{};

	std::vector<u8> setup_buf;
	libusb_transfer* transfer = nullptr;
	bool busy = false;

	// For control transfers
	u8* control_destbuf = nullptr;

	// For fake transfers
	bool fake = false;
	u64 expected_time = 0;
	s32 expected_result = 0;
	u32 expected_count = 0;
};

// Usb descriptor helper
struct UsbDescriptorNode
{
	u8 bLength{};
	u8 bDescriptorType{};

	union
	{
		UsbDeviceDescriptor _device;
		UsbDeviceConfiguration _configuration;
		UsbDeviceInterface _interface;
		UsbDeviceEndpoint _endpoint;
		UsbDeviceHID _hid;
		u8 data[0xFF]{};
	};

	std::vector<UsbDescriptorNode> subnodes;

	UsbDescriptorNode() {}
	template <typename T>
	UsbDescriptorNode(u8 _bDescriptorType, const T& _data)
		: bLength(sizeof(T) + 2), bDescriptorType(_bDescriptorType)
	{
		memcpy(data, &_data, sizeof(T));
	}
	UsbDescriptorNode(u8 _bLength, u8 _bDescriptorType, const u8* _data)
		: bLength(_bLength), bDescriptorType(_bDescriptorType)
	{
		memcpy(data, _data, _bLength - 2);
	}

	UsbDescriptorNode& add_node(const UsbDescriptorNode& newnode)
	{
		subnodes.push_back(newnode);
		return subnodes.back();
	}

	u32 get_size() const
	{
		u32 nodesize = bLength;
		for (const auto& node : subnodes)
		{
			nodesize += node.get_size();
		}
		return nodesize;
	}

	u32 write_data(u8* ptr, u32 max_size) const
	{
		u32 size = std::min<u32>(bLength, max_size);
		memcpy(ptr, this, size);
		for (const auto& node : subnodes)
		{
			const u32 remaining = max_size - size;
			if (remaining == 0)
				break;
			size += node.write_data(ptr + size, remaining);
		}
		return size;
	}
};

class usb_device
{
public:
	usb_device(const std::array<u8, 7>& location);
	virtual ~usb_device() = default;

	virtual bool open_device() = 0;

	void get_location(u8* location) const;
	virtual void read_descriptors();

	virtual u32 get_configuration(u8* buf);
	virtual bool set_configuration(u8 cfg_num);
	virtual bool set_interface(u8 int_num);

	virtual void control_transfer(u8 bmRequestType, u8 bRequest, u16 wValue, u16 wIndex, u16 wLength, u32 buf_size, u8* buf, UsbTransfer* transfer) = 0;
	virtual void interrupt_transfer(u32 buf_size, u8* buf, u32 endpoint, UsbTransfer* transfer) = 0;
	virtual void isochronous_transfer(UsbTransfer* transfer) = 0;

public:
	// device ID if the device has been ldded(0 otherwise)
	u32 assigned_number = 0;
	// base device descriptor, every other descriptor is a subnode
	UsbDescriptorNode device;

protected:
	u8 current_config = 1;
	u8 current_interface = 0;
	std::array<u8, 7> location{};

protected:
	static u64 get_timestamp();
};

class usb_device_passthrough : public usb_device
{
public:
	usb_device_passthrough(libusb_device* _device, libusb_device_descriptor& desc, const std::array<u8, 7>& location);
	~usb_device_passthrough();

	bool open_device() override;
	void read_descriptors() override;
	u32 get_configuration(u8* buf) override;
	bool set_configuration(u8 cfg_num) override;
	bool set_interface(u8 int_num) override;
	void control_transfer(u8 bmRequestType, u8 bRequest, u16 wValue, u16 wIndex, u16 wLength, u32 buf_size, u8* buf, UsbTransfer* transfer) override;
	void interrupt_transfer(u32 buf_size, u8* buf, u32 endpoint, UsbTransfer* transfer) override;
	void isochronous_transfer(UsbTransfer* transfer) override;

protected:
	void send_libusb_transfer(libusb_transfer* transfer);

protected:
	libusb_device* lusb_device = nullptr;
	libusb_device_handle* lusb_handle = nullptr;
};

class usb_device_emulated : public usb_device
{
public:
	usb_device_emulated(const std::array<u8, 7>& location);
	usb_device_emulated(const UsbDeviceDescriptor& _device, const std::array<u8, 7>& location);

	bool open_device() override;
	void control_transfer(u8 bmRequestType, u8 bRequest, u16 wValue, u16 wIndex, u16 wLength, u32 buf_size, u8* buf, UsbTransfer* transfer) override;
	void interrupt_transfer(u32 buf_size, u8* buf, u32 endpoint, UsbTransfer* transfer) override;
	void isochronous_transfer(UsbTransfer* transfer) override;

	// Emulated specific functions
	void add_string(std::string str);
	u32 get_descriptor(u8 type, u8 index, u8* buf, u32 buf_size);
	u32 get_status(bool self_powered, bool remote_wakeup, u8* buf, u32 buf_size);

protected:
	std::vector<std::string> strings;
};
